Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
2	0	EP	call site: 00000	io.BytesIO

Fuzzer calltree


         ...fuzz_graphml.TestOneInput

[function] [call site] 00000


           io.BytesIO

[function] [call site] 00001


           networkx.read_graphml

[function] [call site] 00002